2003 Mercedes Benz 320e Battery warning

JPBARCLAY

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2003 MERCEDES BENZ 320E

3.2L

6 CYL

TURBO

2WD

AUTOMATIC

120,000 MILES

Battery warning display appesr in res saying visit workshop.I have put car in for repair to Mercedes garage and they have repaired part of the wiring loom associated to the battery charging circuit, replaced the starter motor battery charging relay, replaced the starter motor battery and replaced the main battery and the problem still exists